I quite enjoyed this. But I do take exception to the statement
 
"You cannot use XSL to transform to or from non-XML formats like PDF, TeX,
 Microsoft Word, PostScript, MIDI, or others"

as it is supported both explicitly in XT, and implicitly by
<xsl:text>. There is no reason (apart from wordiness) not to write:

<xsl:template match="q">
  <xsl:text>\begin{quote}</xsl:text>
  <xsl:apply-templates/>
  <xsl:text>\end{quote}</xsl:text>
</xsl:template>

and indeed I have done so for an application


Sebastian


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